【单项选择题】
What can be done to enable the debug information for functions to be displayed when using‘ksh -x’to debug a script？（）
A、A.Run the script using ‘ksh -fx’.
B、B.Run the script using ‘ksh -a function -x’.
C、C.Edit the script and add ‘set -x’ at the beginning.
D、D.Edit the script and add ‘set -x’ at the beginning of each function.
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